The process of steel road barrier involves several steps. Here is an overview of the general process:

1. Design: The initial phase of metal guardrail production is the designing of the guardrails. Designers create designs using computer aided design (CAD) programs.

2. Material Selection: The next stage is to choose suitable material for the obstacle, now that you've finalized the design. Steel, aluminum and iron are the most frequently used materials.

3. Cutting: Then we cut it to the required size and shape when we have chosen the materials. This is possible by using different cutting instruments such as water jet, laser or plasma cutter.

4. Forming: After cut, the material can be formed to the target shape and size by bending, rolling and stamping, etc.

5. Welding: When the components are formed, they are welded to the finished barrier. Welding is performed by different methods, among them arc welding and gas welding.

6. Finishing: The obstacle is welded, then finished. This can involve sandblasting, powder coating or painting to protect the metal from the elements and give the metal a decorative finish.

7. Quality Control: Metal fences undergo a quality control test before being dispatched to make sure they meet the necessary standards and are not defective.

In conclusion, the production of a metal barrier is a multistage process that is a difficult one which necessitates a team of experts having specialized knowledge and equipment.